Dial gauge

a dial gauge and dial gauge technology, applied in the direction of measurement gauges, measuring apparatus bearings/suspensions, instruments, etc., can solve the problem of deteriorating measurement accuracy

Inactive Publication Date: 2002-12-24
MITUTOYO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This design prevents deformation transfer from the fitting to the holder, reducing shaky movement and improving measurement accuracy by maintaining slidability and allowing for a smaller clearance without compromising spindle stability.

Problems solved by technology

However, when the clearance is enlarged, shaky movement of the spindle 3 relative to the stem bush 10 can be magnified, so that the measurement accuracy can be deteriorated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

first embodiment

FIG. 1 shows a dial gauge 1A of the first embodiment of the present invention. As in the conventional dial gauge 1, the dial gauge 1A has a spindle 3 having a probe (not shown) to be in contact with the workpiece at a distal end thereof, a body 4 having a display (not shown) for displaying a measured value by a pointer, and a stem 5 provided to the body 4 for slidably holding the spindle 3 through a stem bush 20, where a dimension of the workpiece is measured by detecting a displacement of the spindle 3 relative to the body 4.

As shown in FIG. 2, the stem bush 20 has a fitting 21 fitted to an inner wall of the stem 5 and securing a predetermined clearance against the spindle 3, a holder 22 for slidably holding the spindle 3, the holder 22 securing a predetermined clearance against the inner wall of the stem 5, and an elastically deformable connector 23 for connecting the fitting 21 and the holder 22. The fitting 21, the connector 23 and the holder 22 are sequentially disposed along a...

second embodiment

FIG. 3 shows a dial gauge 1B of the second embodiment of the present invention. Since the present embodiment differs from the above-described first embodiment only in the shape of the stem bush and the other arrangement and functions are the same, the same component will be applied with the same reference numeral to omit or simplify the description thereof.

As shown in FIG. 4, the stem bush 30 has a fitting 31 fixed to an inner wall of the stem 5 and having a predetermined clearance between the spindle 3, a holder 32 for slidably holding the spindle 3, the holder 32 securing a predetermined clearance against the inner wall of the stem 5, and an elastically deformable connector 33 for connecting the fitting 31 and the holder 32.

The fitting 31 is cylindrically formed with an outer circumference thereof fitted to the inner wall of the stem 5. The holder 32 is a cylinder having an inner diameter corresponding to the outer diameter of the spindle 3, where a predetermined clearance is form...

third embodiment

FIG. 5 shows a dial gauge 1C of the third embodiment of the present invention. Since the present embodiment differs from the above-described first and second embodiments only in the shape of the stem bush and the other arrangement and functions are the same, the same component will be applied with the same reference numeral to omit or simplify the description thereof.

As shown in FIG. 6, the stem bush 40 has a fitting 41 fixed to an inner wall of the stem 5 and having a predetermined clearance against the spindle 3, a holder 42 for slidably holding the spindle 3, the holder 42 securing a predetermined clearance against the inner wall of the stem 5, and an elastically deformable connector 43 for connecting the fitting 41 and the holder 42. The fitting 41, the connector 43 and the holder 42 are sequentially arranged along the axial direction of the spindle 3.

The fitting 41 is cylindrically formed with an outer circumference thereof fixed to the inner wall of the stem 5. The holder 42 i...

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Abstract

A dial gauge (1A) has stem bush (20) having a fitting (21) fitted to an inner wall of a stem (5) and having a predetermined clearance between a spindle (3), a holder (22) for slidably holding the spindle (3) while securing a predetermined clearance against the inner wall of the stem (5), and an elastically deformable connector (23) for connecting the fitting (21) and the holder (22), whereby an influence of deformation of the stem (5) and the fitting (21) on the holder (22) during clamping can be minimized, so that the dial gauge (1A) can be fixed to a supporting stand without deteriorating slidability of the spindle (3).

Description

1. Field of the InventionThe present invention relates to a dial gauge. More specifically it relates to a dial gauge for detecting a displacement of a spindle to measure a dimension of a workpiece.2. Description of Related ArtA dial gauge 1 shown in FIGS. 7 and 8 is known as a measuring instrument for measuring a dimension of a workpiece.The dial gauge 1 has a spindle 3 having a probe 2 to be in contact with the workpiece at a distal end thereof, a body 4 having a display 4B for displaying a measured value by a pointer 4A, and a cylindrical stem 5 provided to the body 4 for slidably holding the spindle 3 through a stem bush 10, the dimension of the workpiece is measured by detecting a displacement of the spindle 3 relative to the body 4. Among the above components, the stem bush 10 is formed in a cylindrical shape having outer circumference being fixed to an inner wall of the stem 5 and inner circumference slidably holding the spindle 3. A predetermined clearance is formed between t...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): G01B3/22G01D11/00G01D11/02
CPCG01B3/22G01D11/02
InventorNISHIMURA, YASUNORIFUJIMITSU, TORUSUZUKI, MIKIOSHINOHARA, TOSHIYUKI
OwnerMITUTOYO CORP